Electrochemical detection of dopamine on a Ni/Al layered double hydroxide modified carbon ionic liquid electrode

In this paper a Ni/Al layered double hydroxide (LDH) was first synthesized and further immobilized on a carbon ionic liquid electrode (CILE), which was prepared by using 1-(3-chlorine-2-hydroxypropyl)-3-methylimidazolium acetate as the modifier. The characteristics of LDH/CILE were investigated by scanning electron microscopy (SEM) and cyclic voltammetry. Under the selected conditions the LDH/CILE showed better electrochemical response towards the detection of dopamine (DA) than the CILE. The parameters of DA electro-oxidation on the LDH/CILE were calculated with the values of the electron transfer coefficient (alpha), the number of electrons transferred (n), the apparent heterogeneous electron transfer rate constant (k(s)) and the diffusion coefficient (D) as 0.426, 2.25, 1.66 s(-1) and 7.06 x 10(-5) cm(2)/s, respectively. This modified electrode can be further used to detect DA content in the real drug samples. (C) 2010 Elsevier B.V. All rights reserved.